Don't immediately think that meds are the way to go (they could be, I don't know you or your quality of life) but when I got diagnosed when I was 18, I was told because I am now an adult I have built up coping mechanisms that would benefit me better than meds. Just the knowing that I had ADHD and what my problem areas were enough to help me.

For example I have a less than half than the normal human span of short term memory. So back when it mattered more, like in College, I kept a little notepad with me to remember stuff I needed to know, like deadlines and homework etc. I'm now 29 and I would say I've probably built up more coping mechanisms because I don't do that anymore but I get by way better than before.

I still have issues here and there with procrastination but thankfully I'm in a job I actually enjoy so I compensate it with being able to hyperfocus on a task every now and then.